<template>
    <div>
        <p>父组件的当前值为：{{ number }}</p>
        <CustomSubComponent @upateCount="updateEmitCount"/>
    </div>
</template>

<script setup>
import CustomSubComponent from './CustomSubComponent.vue';
import { ref } from 'vue';
const number =ref(10)
const updateEmitCount=(value)=>{
    number.value+= value
}
</script>